[Webkit-unassigned] [Bug 16062] SVGMatrix multiply method is wrong way round.

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=16062





------- Comment #3 from eric at webkit.org  2007-11-20 03:54 PDT -------
Ok, trying this code with AffineTransform:

    {
        AffineTransform L(0,1,1,0,0,0);
        AffineTransform R(0,0,0,0,1,0);
        AffineTransform LR = L*R;
        AffineTransform RL = R*L;
        printf("LR: %f,%f,%f,%f,%f,%f\n", LR.a(), LR.b(), LR.c(), LR.d(),
LR.e(), LR.f());
        printf("RL: %f,%f,%f,%f,%f,%f\n", RL.a(), RL.b(), RL.c(), RL.d(),
RL.e(), RL.f());
    }

Produced:

LR: 0.000000,0.000000,0.000000,0.000000,1.000000,0.000000
RL: 0.000000,0.000000,0.000000,0.000000,0.000000,1.000000

Which is reversed from what is expected, according to 
http://drj11.wordpress.com/2007/11/19/the-trouble-with-matrix-multiplication/

Interesting to note, the matrix layout shown:
http://www.w3.org/TR/SVG/coords.html#TransformMatrixDefined
is different from the one used by CG:
http://developer.apple.com/documentation/GraphicsImaging/Reference/CGAffineTransform/Reference/reference.html#//apple_ref/c/func/CGAffineTransformMake


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